Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2005-09-27
2005-09-27
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S686000, C359S687000, C359S772000, C359S771000
Reexamination Certificate
active
06950247
ABSTRACT:
A zoom lens of a novel configuration suitable for a collapsible lens barrel is disclosed. More specifically, here is disclosed a zoom lens, comprising four lens units which are, in the order from an object side toward an image side, positive, negative, positive and positive in optical power, and performing zooming by varying distances between each lens units. In this zoom lens, the fourth lens unit has a positive lens element and a negative lens element, and satisfies the following conditional expression:in-line-formulae description="In-line Formulae" end="lead"?νn−νpin-line-formulae description="In-line Formulae" end="tail"?where νn is the Abbe number of the negative lens element of the fourth lens unit, and νp is the Abbe number of the positive lens element of the fourth lens unit.
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Japanese Office Action with English Translation mailed Aug. 24, 2004.
Japanese Office Action with English Translation mailed May 25, 2004.
Morgan & Finnegan , LLP
Thompson Tim
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